CN208386515U - A kind of high-power current-control type negative resistance for resonance circuit - Google Patents
A kind of high-power current-control type negative resistance for resonance circuit Download PDFInfo
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- CN208386515U CN208386515U CN201821495557.7U CN201821495557U CN208386515U CN 208386515 U CN208386515 U CN 208386515U CN 201821495557 U CN201821495557 U CN 201821495557U CN 208386515 U CN208386515 U CN 208386515U
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Abstract
The utility model discloses a kind of high-power current-control type negative resistances for resonance circuit, including exchange controlled voltage source and control circuit, wherein, the control circuit includes the current sampling module being sequentially connected, phase compensation block, zero crossing comparison module and switch drive module, the input current of the current sampling module sampling harmonic circuit, the square wave with the complete reverse phase of input current is converted into through phase compensation block and zero crossing comparison module, the driving signal of switching device is generated to exchanging controlled voltage source through switch drive module, the exchange controlled voltage source generates fundamental voltage according to driving signal between positive output end and negative output terminal.Different capacity grade may be implemented in the utility model, has the characteristics that working characteristics is flexible, online adjustable, provides reference in the practical application of various power occasions for exchange negative resistance.
Description
Technical field
The utility model relates to the technical fields of negative resistance construction, refer in particular to a kind of high-power electricity for resonance circuit
Flow control type negative resistance.
Background technique
Negative resistance is the Single port active component for meeting Ohm's law.Existing negative resistance construction is broadly divided into three kinds: one
It is that the element for having negative resistance effect is constituted using semiconductor material；Second is that using non-linear element (diode and transistor etc.) and
Positive resistance constitutes negative resistance；Third is that forming negative impedance converter using operational amplifier and positive resistance.Due to method constructed above
The active power of output is limited, offsets positive resistance commonly used in microwave radio circuit and improves resonator quality factor；Or for non-
Linear circuit studies dynamic behaviors such as nonlinear system fork or chaos etc..Scholar has found negative resistance answering for power occasion
With also having significant advantage, such as it can effectively improve using negative resistance the transmission characteristic of radio energy transmission system.However,
The building method of existing negative resistance is concentrated mainly on small-power negative resistance, seriously limits negative resistance at such several hundred supreme kilowatts
Large-power occasions application.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, propose a kind of for the high-power of resonance circuit
Different capacity grade may be implemented in current-control type negative resistance, has the characteristics that working characteristics is flexible, online adjustable, for exchange
Negative resistance provides reference in the practical application of various power occasions.
To achieve the above object, technical solution provided by the utility model are as follows: a kind of for the high-power of resonance circuit
Current-control type negative resistance, including connected exchange controlled voltage source and control circuit, the exchange controlled voltage source and control
Circuit is connected with resonance circuit respectively, wherein the control circuit includes the switch drive module being sequentially connected, Zero-cross comparator mould
Block, phase compensation block and current sampling module, the input current of the current sampling module sampling harmonic circuit, are mended through phase
It repays module and zero crossing comparison module is converted into square wave with the complete reverse phase of input current, generate switching device through switch drive module
Driving signal to controlled voltage source is exchanged, the exchange controlled voltage source is according to driving signal in positive output end and negative output terminal
Between generate fundamental voltage.
Further, the exchange controlled voltage source is by that can export the high-frequency ac inverter circuit structure of high-frequency alternating voltage
At the high-frequency ac inverter circuit output fundamental voltage and input current phase phase difference 180 degree, outside active power of output.
Further, the phase compensation block can be according to external resonance circuit adjust automatically phase offset, through phase compensation
Current signal afterwards always with the same phase of input current.
The utility model compared with prior art, have the following advantages that with the utility model has the advantages that
High-power current-control type negative resistance provided by the utility model for resonance circuit, can work in input current
The case where negative resistance electric current is high frequency is flowed through, the relationship of input current and input voltage meets at resonance frequency
Negative resistance relationship, and the negative resistance power grade that the utility model is realized is determined by exchange controlled voltage source, therefore optional
With the exchange controlled voltage source of different capacity grade to adapt to different power applications.Wherein, inverse using high-frequency electrical die mould
Power transformation road is used as exchange controlled voltage source, its main feature is that: first, exportable high-frequency alternating voltage meets exchange negative resistance
The demand of high frequency operation；Second, control circuit is analog circuit, control precision height and rapid dynamic response speed, system starting of oscillation
Start-up circuit is not needed；The watt level of third, negative resistance is determined by the rated power of high-frequency inverter circuit, can pass through design
The running parameter of inverter circuit realizes the negative resistance of different capacity grade.The above feature is exchange negative resistance in various power fields
The practical application of conjunction provides reference.
Detailed description of the invention
Fig. 1 is the negative resistance illustraton of model provided in embodiment.
Fig. 2 is the circuit diagram for realizing negative resistance in embodiment using full-bridge voltage type inverter.
The waveform diagram of input current and control circuit signal when Fig. 3 is circuit starting of oscillation shown in Fig. 2 in embodiment.
The waveform diagram of input voltage and input current when Fig. 4 is circuit stable state shown in Fig. 2 in embodiment.
Specific embodiment
Specific implementation for the content and feature that the utility model is further described, below in conjunction with attached drawing to the utility model
Scheme is specifically described.But the implementation and protection of the utility model are without being limited thereto.
As shown in Figure 1, the high-power current-control type negative resistance of resonance circuit is used for provided by the present embodiment, it is basic
Principle is the output voltage that controlled voltage source is exchanged with the zero crossing information control of the resonance current using resonance circuit, so that electric
The fundamental wave amount of the input voltage on road is always with input current reverse phase, and entire circuit is equivalent to a negative resistance 8, including connected friendship
Controlled voltage source 1 and control circuit 3 are flowed, controlled voltage source 1 is exchanged and control circuit 3 is connected with resonance circuit 2 respectively, control electricity
Road 3 includes switch drive module 4, zero crossing comparison module 5, phase compensation block 6 and the current sampling module 7 being sequentially connected, electricity
It flows sampling module 7 and samples input current iin, it is converted into and input current i through phase compensation block 6 and zero crossing comparison module 5inIt is complete
The square wave for the phase that is all-trans, the driving signal for generating switching device through switch drive module 4 exchange controlled to exchange controlled voltage source 1
Voltage source 1 generates fundamental voltage u according to driving signal between positive output end P and negative output terminal NF。
In above-mentioned exchange negative resistance, input voltage fundamental wave amount and input current fundamental wave amount expire known to Ohm's law
Foot:
Exchanging controlled voltage source is made of the high-frequency ac inverter circuit of exportable high-frequency alternating voltage, can be outside
Active power of output meets negative resistance property.The basic functional principle of high-frequency ac inverter circuit is by input current iinConversion
For the switching drive signal of same phase, for driving the switching tube in inverter circuit, thus the output fundamental voltage u of control circuitF,
So that input current iinAt resonance frequency always with input voltage uinFundamental wave amount reverse phase always.
Control circuit principle is that current sampling module samples Sinusoidal Input Currents iin, obtain sampled current signals iS, electric current
Sampling module includes energy-storage travelling wave tube, iSWith iinPhase shift, phase compensation block is to sampled current signals iSCarry out phase
The i ' obtained after the adjustment of positionSAlways with input current iinSame phase.Sampled current signals i ' after phase compensationSBy zero passage ratio
It is square-wave signal compared with module converter, send to switch drive module, thus high-frequency ac inverter circuit is according to driving signal just defeated
Fundamental voltage u is generated between outlet and negative output terminalF。
In this example, high-frequency ac inverter circuit uses full-bridge voltage type inverter, as shown in Figure 2.Wherein L1And C1For string
Join resonant branch, R1For the internal resistance of series resonance branch, S1And S4As a pair of switches pipe, S2And S3As a pair of switches pipe, at
Pair two switching tubes simultaneously turn on, each conducting 180 degree of two pairs of alternatings, switching tube S1And S4Drive waveforms and input current iin
Reverse phase, switching tube S2And S3Drive waveforms and input current iinSame phase, i.e., as input current iinWhen < 0, switching tube S is opened1、S4
So that uin>0；As input current iinWhen > 0, switching tube S is opened2、S3So that uin<0.Switch drive module according to input current
iinThe square-wave signal i of reverse phaseDGenerate sinusoidal pulse width modulation signal, driving switch pipe.At this point, the output voltage of full bridge inverter
Fundamental wave amount uFAre as follows:
uF(t)=MVdcsin(ωt)。 (1)
Wherein M is pulsewidth modulation ratio.
Assuming that input voltage fundamental wave uFIt is with phasor representationInput current phasor representation isThen have:
The switching drive signal that high frequency full bridge inverter switching tube is generated by control circuit as shown in Figure 1 drives, and makes
Obtain input voltage fundamental waveAlways with input currentReverse phase, the at this time running frequency of system are as follows:
Corresponding negative resistance resistance value at this time are as follows:
RN=-R1 (4)
By formula (3) and (4) it is found that the working frequency and resistance value of exchange negative resistance are related with resonance circuit.
Below in conjunction with the basic principle of control circuit in full-bridge voltage type inverter circuit explanatory diagram 1 as shown in Figure 2, control
Circuit is broadly divided into four parts: current sampling module, phase compensation block, zero crossing comparison module and switch drive module.Electricity
When road starts, L is flowed through1、C1And R1The electric current of series resonance branch be zero, switching tube S at this time1And S4Initial driving signal
ug1And ug4Show as positive level, switching tube S1And S4Conducting, DC voltage source VdcWith L1、C1And R1Series resonance branch constitutes two
Rank circuit starts to generate electric current, the electric current i after the sampled circuit of the current informationSThere are phase offsets, through phase compensating circuit
Current information i ' laterSWith input current iinSame-phase is converted into two complementary square waves after zero crossing comparison module, such as schemes
Shown in 3, switch drive module generates sinusoidal pulse width modulation according to square-wave signal and controls signal, provides drive to inverter circuit switching tube
Dynamic signal.
Assuming that high-frequency inverter circuit input DC power voltage is 48V.When the external LRC series resonance branch in negative resistance both ends
When, the parameter of series resonant circuit are as follows: L1=300 μ H, C1=211.11nF, R1=2 Ω.Circuit enters the defeated of stable state post-simulation
Enter voltage and input current waveform is as shown in Figure 4.The working frequency for exchanging negative resistance is fS=20kHz, the resistance value of negative resistance are RN
=-2 Ω.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by described
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (3)
1. a kind of high-power current-control type negative resistance for resonance circuit, it is characterised in that: controlled including connected exchange
Voltage source (1) and control circuit (3), the exchange controlled voltage source (1) and control circuit (3) respectively with resonance circuit (2) phase
Even, wherein the control circuit (3) includes the switch drive module (4) being sequentially connected, zero crossing comparison module (5), phase compensation
Module (6) and current sampling module (7), the input current of current sampling module (7) the sampling harmonic circuit (2), through phase
Compensating module (6) and zero crossing comparison module (5) are converted into the square wave with the complete reverse phase of input current, through switch drive module (4)
The driving signal of switching device is generated to exchanging controlled voltage source (1), the exchange controlled voltage source (1) exists according to driving signal
Fundamental voltage is generated between positive output end (P) and negative output terminal (N).
2. a kind of high-power current-control type negative resistance for resonance circuit according to claim 1, it is characterised in that:
Exchange controlled voltage source (1) is made of the high-frequency ac inverter circuit that can export high-frequency alternating voltage, the high frequency
Ac converter circuit output fundamental voltage and input current phase phase difference 180 degree, outside active power of output.
3. a kind of high-power current-control type negative resistance for resonance circuit according to claim 1, it is characterised in that:
Current signal after the phase compensation block (6) phase compensation always with the same phase of input current.
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| CN201821495557.7U CN208386515U (en) | 2018-09-13 | 2018-09-13 | A kind of high-power current-control type negative resistance for resonance circuit |
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| CN201821495557.7U CN208386515U (en) | 2018-09-13 | 2018-09-13 | A kind of high-power current-control type negative resistance for resonance circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067391A (en) * | 2018-09-13 | 2018-12-21 | 华南理工大学 | A kind of high-power current-control type negative resistance for resonance circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067391A (en) * | 2018-09-13 | 2018-12-21 | 华南理工大学 | A kind of high-power current-control type negative resistance for resonance circuit |
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